RadioBanter - View Single Post - Impedance of a printed circuit board antenna?

October 20th 03, 06:13 PM

On 20 Oct 2003 02:14:38 -0700, (Daniel) wrote:

Hi there,

I am currently working on a project which leads to simulate EMC Field
coupling to printed circuits.

Without discussion of a frequency or band of frequencies, you are sure
to be either deeply disappointed or vastly rewarded in results.

The Field couples into the circuitry
through (unwanted) loops and di/monopoles.

Certainly, this is true at all scales. Your problem is not that so
much as it is a matter of degree. As this turns on the same issue of
what frequency, it also turns on the issue of what size? Beyond that,
it becomes a problem of how near (or how far). You may note that
there is a lot of dimensionality here that is wholly lacking in your
question.

I started with modeling a simple loop and a stub. I experienced no
problems for the loop, but the stub is driving me crazy:
In order to calculate the output voltage of a PCB antenna for a given
geometry and EM-Field at a desired frequency, I need to know the
output impedance for this antenna. I didn't find anything on the web
on calculating/extracting it.

This, in fact, is one of the easiest things to determine - if you know
the frequency and physical dimension.

This brings up the question, wether it is possible or not? If yes, how
can i perform the calculation? Do you have any suggestions? If I am am
totally wrong, please feel free to correct me.

Thanks in Advance

Greets

Daniel

Hi Daniel

How? The clues above give a significant indication.

73's
Richard Clark, KB7QHC